NASA LogoNTRSNTRS - NASA Technical Reports ServerSearchmore_vertCollectionsAboutNewsHelpLogin Back to ResultsA cloud, precipitation and electrification modeling effort for COHMEXIn mid-1987, the Modeling Group of the Institute of Atmospheric Sciences (IAS) began to simulate and analyze cloud runs that were made during the Cooperative Huntsville Meteorological Experiment (COHMEX) Project and later. The cloud model was run nearly every day during the summer 1986 COHMEX Project. The Modeling Group was then funded to analyze the results, make further modeling tests, and help explain the precipitation processes in the Southeastern United States. The main science objectives of COHMEX were: (1) to observe the prestorm environment and understand the physical mechanisms leading to the formation of small convective systems and processes controlling the production of precipitation; (2) to describe the structure of small convective systems producing precipitation including the large and small scale events in the environment surrounding the developing and mature convective system; (3) to understand the interrelationships between electrical activity within the convective system and the process of precipitation; and (4) to develop and test numerical models describing the boundary layer, tropospheric, and cloud scale thermodynamics and dynamics associated with small convective systems. The latter three of these objectives were addressed by the modeling activities of the IAS. A series of cloud modes were used to simulate the clouds that formed during the operational project. The primary models used to date on the project were a two dimensional bulk water model, a two dimensional electrical model, and to a lesser extent, a two dimensional detailed microphysical cloud model. All of the models are based on fully interacting microphysics, dynamics, thermodynamics, and electrical equations. Only the 20 July 1986 case was analyzed in detail, although all of the cases run during the summer were analyzed as to how well they did in predicting the characteristics of the convection for that day.Document ID19910018397Acquisition SourceLegacy CDMSDocument TypeContractor Report (CR)AuthorsOrville, Harold D.*(South Dakota School of Mines and Technology Rapid City, SD, United States)*Helsdon, John H.*(South Dakota School of Mines and Technology Rapid City, SD, United States)*Farley, Richard D.*(South Dakota School of Mines and Technology Rapid City, SD, United States)*Date AcquiredSeptember 6, 2013Publication DateAugust 1, 1991Subject CategoryMeteorology And ClimatologyReport/Patent NumberSDSMT/IAS/R-91/04NASA-CR-188679NAS 1.26:188679Accession Number91N27711Funding Number(s)CONTRACT_GRANT: NAG8-632Distribution LimitsPublicCopyrightWork of the US Gov. Public Use Permitted.Available DownloadsNameType19910018397.pdfSTIcloud_downloadcontent_copyvisibilityRelated RecordsThere are no records associated with this record.visibility_offNo Preview Available
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